I'm in the same boat with my MBP. Since Leopard: hard freezes, soft freezes and even the white tint. Have stopped using safari. I thinking I will do a reinstall when I have time sometime.
Back on topic, I'd held back on Office 2008 because of the reported slowness. I'm shocked to hear that it also quits the whole time (I can't believe they fixed them all with this update...). I have that now with Office 2004. Why would I pay to lose the ability to run macros and gain nothing except a slightly more ungainly interface (IMHO)? As Macs get more powerful, at least Office 2004 will get faster and no worse.
Slowness?? What slowness? Office 2008 is just as fast on my MacBook AIR as it is on my PC (Office 2007). Mine launches in seconds, not minutes.